Fix README.md for json_to_table

[akiomik]

set_object_mode method has been renamed to object_orientation at #321.

tabled/json_to_table/src/table/mod.rs

Lines 186 to 189 in 300c07b

	pub fn object_orientation(&mut self, mode: Orientation) -> &mut Self {
	self.cfg.object_orientation = mode;
	self
	}

[zhiburt]

Thanks once again @akiomik